HURLBURT FIELD, Fla. -- Twelve special tactics Airmen enter the base as they conclude an 824-mile memorial ruck sack march at Hurlburt Field Oct. 16, 2009. The men marched from San Antonio to Hurlburt Field to honor Staff Sgt. Timothy Davis, a combat controller assigned to the 23rd Special Tactics Squadron when he was killed in action Feb. 20, 2009, and 12 other fallen special tactics members. (U.S. Air Force photo by Drew Buchanan)